Seebohm and Dieckstahl
Seebohm and Dieckstahl of Dannamora Steel Works, Sheffield
Known for its range of special steels and for using and making known a scientific approach to steel making.
Operations were afterwards transferred to Attercliffe and to Doctor's Fields in Sheffield.
1869 Acquired the Dannamora Works, Sheffield; made substantial changes to convert them into a crucible steel works.
1899 Incorporated as a limited company.
Largely because of Balfour's awareness of American developments, his firm was one of the first two in Sheffield to develop high-speed steel in 1901.
1902 Set up as associated company, Eagle and Globe Steel Co.
1905 The company established a research laboratory
Sold considerable quantities of tool steels in USA.
1910 Established the engineers' tool department which became the largest of the company's activities.
1914 Directory: Manufacturers of crucible cast steel for tools etc. 
1914 Steel manufacturers. Specialities: "Capital" high-speed and "DSW" steels, all kinds of crucible cast steel for tools etc., Siemens-Martin and Bessemer steels, hammers, saws, files, picks etc. 
WWI Became Arthur Balfour and Co as anti-German feelings increased